Apparatus and method to maximize buffer utilization in an...

Details Apparatus and method to maximize buffer utilization in an... Apparatus and method to maximize buffer utilization in an...

2004-03-31

2008-10-21

Dollinger, Tonia L. M. (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Flow controlling

C710S033000, C710S052000, C710S057000

Reexamination Certificate

active

07441055

ABSTRACT:
An apparatus and method for maximizing buffer utilization in an I/O controller using credit management logic contained within the I/O controller. The credit management logic keeps track of the number of memory credits available in the I/O controller and communicates to a chipset connected to the I/O controller the amount of available memory credits. The chipset may then send an amount of data to the I/O controller equivalent to or less than the communicated available amount of memory credits to reduce the occurrence of a “retry” event. The amount of available memory credits is determined by comparing the available memory in each buffer within the I/O controller and designating that the “available” amount of memory for the I/O controller is an amount equivalent to the amount of memory contained in the buffer with the least amount of available memory. This “available” amount of I/O controller memory may then be converted into memory credits and communicated to the chipset.

REFERENCES:
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patent: 6009488 (1999-12-01), Kavipurapu
patent: 6240095 (2001-05-01), Good et al.
patent: 2002/0150049 (2002-10-01), Collier et al.
patent: 2003/0223369 (2003-12-01), Anderson

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